Carburetor



Sept. 20, 1932. l A. L. NlLssoN CARBURETOR Filed lApril 7, 1928 colnbustion motor when cold, an arrangement Patented Sept. 20, 1932 TD STA 'rss lare FfFilCE cAnBURE'roB- l l Application inea April 7, 192s', serialNo.

In order to enable starting of an internal is required inthe carburetor facilitating suchv adjustment of the latter that the fuel mixture f2 will be abnormally rich in fuel at the start.

According as the commercial motor fuel isv rendered qualitatively inferior in the course of time by a decrease of the amount of lighter hydrocarbons contained therein, such an arrangement in the carburetor has become of an ever increasing importance in the running of motor vehicles.

The devices hitherto used for this purpose are substantially based on the principle of providing, by throttling of the air in the airintake of the carburetor, first, a reduction of the entering quantity of air and, second, an increase of the vacuum causing the outflow of the fuel from the fuel container, the amount of fuel being thus increased simultaneously with a decrease of the amount of alr. Y

In such arrangements, however, the risk is incurred that too great an amount of ungasified fuel enters the motor on an increase of the number of revolutions of the motor, after the start has been effected. 4

The present invention is based on the principle that an additional quantity of fuel is introduced at the start, without any alteration then taking place either with respect to the quantity of air or the amount of the escaping fuel, when the vacuum in the airintake is subsequently increased.

The invention is principally characterized by the fact that there is arranged between the air-intake on the one hand and the fuel container of the carburetorv on the other` hand, a connection such that a quantity of fuel present therein by reason of the hydraulic pressure from the container is entrained on account of the air flowing through the air-intake when the said connection is opened.

An embodiment of the invention is disclosed in. the accompanying drawing showing by way of diagrammatic representation a vertical section through a carburetor provided with means according tothe invention.

1 designates the carburetor casing, 2 the 265,256, and iii Germany' April 14, 1,927; l

air-intake, 3 the fuel container, 4 the main calibrated opening, 5 a channel leading to the atomizer 6, Zthe calibrated 'opening for idle running, y 8. the channel for 4idle running, which latter channel opens in the wallof the carburetor casing 1 at the throttling lnelnber 9. 10 denotes a connecting passagebetween k5 and 8, and 11 a slide'having a passage 12 by meansof which the communication bevturned so that theconnection between chantween the channels 5 and 8 may be openedl or closed.

vnels 5 and 8 is` opened. In addition to the fuel then flowing fromythe calibrated open` ing v for idle,v running andout through the channel 8, the whole ofthe fuel quantity present inthe channel system outside `the mainy nozzler 4 will then also be sucked through the channels 10 and 12 into the channel 8 for idle running iand, further, out

through the port 14 at the throttling member 9, where the fuel is atomized and mixed with air. Y

The fuel mixture thus obtained is,`to begin with, very rich in fuel, but is automatically rendered poorer as soon'as all fuel in the said channel system has beenV sucked off.

The mixture, however, continues to be richer than that used in normal idle running, inasmuch as all fuel escaping through the main calibrated opening 4 by reason of the hydraulic pressure is sucked into the channel 8 for idle running, together with air from the f air opening 13. It is conditional, however,

for the operation of such an arrangement, that the main calibrated opening 4 is situated below the fuel level, and that a certain amount of fuel passing the main calibrated opening 4 lis contained in the channel system through which the slide 11 is connected with the channel 8 foridle running.

What I claim is :u

` 1. yIn a carburetor, the combination of a fuell container, an atomizer, an idling outlet, a conduit connecting said fuel container to said atomizer', a second conduitconnecting said fuel container ,to said idling outlet, a calibrated opening between said container and said conduits, an air inlet between said lul calibrated opening and said idling outlet, a second calibrated opening between said air inlet and said rst named calibrated opening, a third conduit affording communication bel@ tween the conduit leading to the atomizer and L'Jl ing

idling conduit between said outlet andvsaidrA that portion of the conduit leading to the idling outlet, which lies betweenethe Asecond named calibrated opening and the idling outlet and arvalve in said third conduit forclosing the same after motor starting has been effected. "u 'v 'Y l 2. The combination with a carburetor hava fuel container, an idling outlet, an

container, a calibrated orifice in said conduit,

an atomizer, and a fuel conduit between said container and atomlzer, of a conduit extending between said idling conduit at a point Aabove said calibrated orifice `and said fuel conduit at a point below the normal fuel level in said container, and a Valve in'said last conduit.

3. The combination with a carburetor having a fuel container, a calibrated outlet therefor, an idling outlet connected to said outlet by an idling conduit, an air inlet and a calibrated orifice in said idling conduit, an atomizer, and a fuel conduit connecting said orifice with said atomizer, of a conduit connecting n said idling and fuel conduits, said connecting conduit opening into said idling conduit above said calibrated orifice and opening into said fuel conduit below the normal fuel level in said container, and aV valve in said last conduit.

, VIn testimony whereof I aiiiX my signature.

n AUGUST LEANDER NILSSON.' 

